 /*******************************************************************************
  * Copyright (c) 2005, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.internal.actions;

 import org.eclipse.core.runtime.Assert;
 import org.eclipse.core.runtime.IAdaptable;
 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.window.Window;
 import org.eclipse.ui.IPerspectiveDescriptor;
 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchWindow;
 import org.eclipse.ui.WorkbenchException;
 import org.eclipse.ui.actions.ActionFactory;
 import org.eclipse.ui.internal.IWorkbenchGraphicConstants;
 import org.eclipse.ui.internal.Workbench;
 import org.eclipse.ui.internal.WorkbenchImages;
 import org.eclipse.ui.internal.WorkbenchMessages;
 import org.eclipse.ui.internal.WorkbenchPlugin;
 import org.eclipse.ui.internal.dialogs.SelectPerspectiveDialog;

 /**
  * Action to open the Open Perspective dialog.
  *
  * @since 3.1
  */
 public class OpenPerspectiveDialogAction extends Action implements
         ActionFactory.IWorkbenchAction {

     private IWorkbenchWindow workbenchWindow;
     
     /**
      * Creates a new open perspective dialog action.
      *
      * @param window the window containing the action
      */
     public OpenPerspectiveDialogAction(IWorkbenchWindow window) {
         Assert.isNotNull(window);
         this.workbenchWindow = window;
         setText(WorkbenchMessages.OpenPerspectiveDialogAction_text);
         setToolTipText(WorkbenchMessages.OpenPerspectiveDialogAction_tooltip);
         setImageDescriptor(WorkbenchImages.getImageDescriptor(
               IWorkbenchGraphicConstants.IMG_ETOOL_NEW_PAGE));
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.jface.action.Action#run()
      */
     public void run() {
         if (workbenchWindow == null) {
             return;
         }
         SelectPerspectiveDialog dlg = new SelectPerspectiveDialog(workbenchWindow
                 .getShell(), workbenchWindow.getWorkbench().getPerspectiveRegistry());
         dlg.open();
         if (dlg.getReturnCode() == Window.CANCEL) {
             return;
         }
         IPerspectiveDescriptor desc = dlg.getSelection();
         if (desc != null) {
             try {
                 IWorkbench workbench = workbenchWindow.getWorkbench();
                 IAdaptable input = ((Workbench) workbench)
                         .getDefaultPageInput();
                 workbenchWindow.openPage(desc.getId(), input);
             } catch (WorkbenchException e) {
                 WorkbenchPlugin.log("Error opening perspective ", e); //$NON-NLS-1$
 }
         }
     }
     
     /* (non-Javadoc)
      * @see org.eclipse.ui.actions.ActionFactory.IWorkbenchAction#dispose()
      */
     public void dispose() {
         workbenchWindow = null;
     }
 }

